-Xms and -Xmx is Virtual Machine (VM) arguments that can be used while executing Java applications to make set the minimum and maximum heap size.
You can know more about all the VM arguments by executing the command in Command-Line or Terminal using java -X command
bash-3.2$ java -X
-Xbatch disables background compilation
-Xbootclasspath/a:<directories and zip/jar files separated by :>
append to end of bootstrap classpath
-Xcheck:jni perform additional checks for JNI functions
-Xcomp forces compilation of methods on the first invocation
-Xdebug provided for backward compatibility
-Xdiag show additional diagnostic messages
-Xfuture enable strictest checks, anticipating future default
-Xint interpreted mode execution-only
-Xinternalversion
displays more detailed JVM version information than the
-version option
-Xloggc:<file> log GC status to a file with time stamps
-Xmixed mixed-mode execution (default)
-Xmn<size> sets the initial and maximum size (in bytes) of the heap
for the young generation (nursery)
-Xms<size> set initial Java heap size
-Xmx<size> set maximum Java heap size
-Xnoclassgc disable class garbage collection
-Xrs reduce the use of OS signals by Java/VM (see documentation)
-Xshare:auto use shared class data if possible (default)
-Xshare:off do not attempt to use shared class data
-Xshare:on require using shared class data, otherwise fail.
-XshowSettings show all settings and continue
These extra options are subject to change without notice.
The following options are Mac OS X specific:
-XstartOnFirstThread
run the main() method on the first (AppKit) thread
-Xdock:name=<application name>
override default application name displayed in dock
-Xdock:icon=<path to icon file>
override default icon displayed in dock
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